Hello,
I have a 1990 Nissan D21 King cab with two bucket seats that are totally shot. I have taken one of the seats apart and have been looking for replacement foam all over the internet with no luck. Does anyone know of a supplier.
I've also been considering buying a sheet of high density foam and attempting to contour it myself. Has anyone done this or have any other suggestions for alternatives?

take it to an interior shop. rebuilding a seat is childs play to them and fast.

I agree,between hog rings, contouring the foam stretching the material it would be easier to just go to a shop. On the other hand why not just find a good pair at a pick-a-part. It sure would be cheaper.
A few years ago I had the seats for a 1970 Dodge Challenger Reupholstered. I supplied the foam and the covers. The cost for that was $500 ( it was leather)
to reupholster them 2 buckets and the backseat was $350.
Gonna be a whole lot cheaper to find a good set out in the yard.

I too have a '90 king cab, and my seats look practically new with 215k on the odo. Amazing, really! But I'd like to replace them with a more comfortable seat, and one with more side bolstering. Speaking of junk yards, what have people replaced the OEM seats with, other than new originals?

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Professional Car Audio technician and fabricator, as well as a Nissan/Datsun fanatic

Those RX7 seats are sweet! I'd love to put something like that in, but I doubt I can count on being that lucky. FCs aren't often in the junk yard at all, and when you add the odds of getting a good color in good shape, the odds nearly hit zero. There is an older Pathfinder in the yard right now, and I do like those seats. They are grey like my interior, and in decent shape! I may need to snag them.

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Professional Car Audio technician and fabricator, as well as a Nissan/Datsun fanatic